28 sr principal software engineer jobs at 19 companies in Middletown, DE
2mo
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Sr. Principal Cyber Software Engineer
Annapolis Junction or San Antonio or Aurora or Carey
$149k-$235k/yr OnsiteFull Time
8+ YOEBachelor's degree in computer science, information systems, or network engineering with 8+ years experience; strong C/C++, Java, Python; CNO tools; Windows/.NET and Unix/Linux development.
C, C++, Java, Perl, Python, Visual Studio, NET, Unix/Linux, Makefiles
4d
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Principal Engineer, Software Engineering - eCommerce Applications
Conshohocken or Delaware or New Jersey
$111k-$221k/yr RemoteFull Time
10+ YOEBachelor's degree and 10+ years in software engineering, including 3+ years in a principal, staff, lead, or equivalent role. Requires enterprise eCommerce experience and proficiency with modern architectures, programming, cloud, security, and DevSecOps.
Microservices, RESTful APIs, Java, C#, JavaScript, TypeScript, Python, Azure, AWS, Google Cloud, CI/CD, DevSecOps, Adobe Commerce, Magento, Salesforce Commerce Cloud, SAP Commerce Cloud, Shopify Plus, Adobe Experience Manager, Sitecore, Azure API Management, Okta, Azure AD, Auth0, Kubernetes
2mo
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Principal Software Engineer, Field Engineering
Aberdeen Proving Ground, Maryland, United States
$160k-$220k/yr OnsiteFull Time
5+ YOE5+ years hands-on software engineering; active Secret clearance; backend Go/Java/Rust; DevSecOps; Kubernetes; Bash/Python; Army-domain knowledge; customer-facing; Security+ readiness; willing to relocate to APG.
Go, Java, Rust, Kubernetes, Helm, CI/CD, Infrastructure as Code, Bash, Python, RMF
1d
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Principal Software Engineer
Plano or Boston or Portsmouth or Indianapolis or Columbus or United States or Los Angeles or Philadelphia or San Francisco
$137k-$257k/yr HybridFull Time
8+ YOERequires 8+ years of software engineering experience, enterprise architecture and technical leadership, distributed systems expertise, cloud-native development, and proficiency with JavaScript/TypeScript, React, Node.js, and related tools.
JavaScript, TypeScript, React, Node.js, Next.js, Java, HTML/CSS, Micro Frontends, AWS, CDK, GitHub Actions, OAuth 2.0, OpenID Connect, OWASP Top 10, Playwright, JMeter, Datadog, Splunk, Bridgeway, MFE, CI/CD, DevOps, SecOps, Generative AI
2d
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Principal Software Engineer/Principal AI Engineer
Philadelphia or Massachusetts
$115k-$192k/yr RemoteFull Time
10+ YOE10+ years software engineering experience with hands-on enterprise AI systems taken to production; BS in engineering or computer science required, advanced degree preferred; expertise in LLMs, cloud, integration, architecture, and delivery.
Microsoft?
2d
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Principal Software Engineer/Principal AI Engineer
Philadelphia or Massachusetts
$115k-$192k/yr RemoteFull Time
10+ YOE10+ years of software engineering experience with enterprise AI systems, production delivery, cloud platforms, LLMs, APIs, data pipelines, architecture, Agile, CI/CD, TDD, and technical leadership. BS in engineering or computer science required.
Microsoft Azure, AWS, Google Cloud Platform, Python, Java, TypeScript, JavaScript, SQL, MCP, RAG, CI/CD, TDD, APIs
1mo
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Principal Software Engineer
United States or Vienna or Baltimore
$220k-$372k/yr OnsiteFull Time
12+ YOE12+ years software development experience with expertise in cloud-native, storage and data management; proficiency in NFS/SMB/iSCSI and programming in C/C++/Golang/Node.js/Python.
C, C++, Golang, Node.js, Python, NFS, SMB, iSCSI, Docker, Kubernetes, GitHub, Jenkins, Ansible
1mo
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Principal Software Engineer
Philadelphia, Pennsylvania, United States
HybridFull Time
12+ YOE12+ years in 3D runtime or game engine development, expert C++ (C++17/20/23), graphics APIs (Vulkan, DirectX 12, Metal), engine integrations, profiling/optimization, and strong communication.
C++17, C++20, C++23, Vulkan, DirectX 12, Metal, Unreal Engine, Unity, NVIDIA Omniverse, glTF, 3D Tiles
1mo
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Principal Software Engineer
Baltimore or Seattle or Vienna or United States or United States
$220k-$372k/yr HybridFull Time
12+ YOE12+ years software development, 5+ years data management/storage experience, 3+ years cloud-native and SOA expertise, proficiency with storage protocols and listed programming tools, strong communication and architectural skills.
C, C++, Golang, Node.js, Python, Docker, Kubernetes, GitHub, Jenkins, Ansible, CI build systems, Automated Testing, NFS, SMB, iSCSI
1mo
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Principal Software Engineer - AI Engineer
Jersey City or Wilmington or Palo Alto
$204k-$285k/yr OnsiteFull Time
7+ YOE7+ years software engineering experience; strong Python and PyTorch/TensorFlow; experience with vector storage, agentic AI and LLM deployment, MLOps and CI/CD, cloud (AWS or Azure); leadership and responsible AI practices.
Python, PyTorch, TensorFlow, Vector storage systems, CI/CD, MLOps, AWS, Azure, LLM Suite
2w
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Principal Software Engineer, Core Services
Wayne or Naperville
$160k-$185k/yr HybridFull Time
10+ YOE10+ years software engineering experience, bachelor’s in CS or equivalent, deep TypeScript/Node.js skills, cloud-native and distributed systems experience, leadership and mentoring experience.
TypeScript, Node.js, NestJS, EC2, Lambda, S3, SNS, SQS, Docker, Kafka, React, Kubernetes, GitHub Copilot, Claude Code, OpenAI Codex
2mo
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Principal Software Engineer
Annapolis Junction, Maryland, United States
$215k-$250k/yr OnsiteFull Time
12+ YOETwelve years SWE experience; BS in CS; frontend React; Node.js/Rust; Python; Shell; Kubernetes; microservices; multi-site apps; cloud migration.
JavaScript, TypeScript, React, Node.js, Rust, Python, Shell, Kubernetes, Microservices, Cloud
2mo
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Principal Software Development Engineer
Philadelphia, Pennsylvania, United States
OnsiteFull Time
15+ YOEExtensive experience in Linux-based systems and C/C++/Golang/Python; knowledge of distributed systems, cloud-native/containerized environments, and carrier-grade network infrastructure; 15+ years relevant experience and Bachelor's degree preferred.
Linux, C, C++, Golang, Python, Docker, Kubernetes
2mo
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Principal Software Development Engineer (IC4) - Network Region Build (NRB)
United States or Abilene or Austin or Nashville or Chicago or Pittsburgh or Philadelphia or Saline
$115k-$235k/yr OnsiteFull Time
6+ YOEStrong software engineering in Python/Java/Go/Rust, networking fundamentals (BGP, TCP/IP, IPv6), experience with distributed systems, Git and CI/CD, Linux production environments; 6+ years experience.
Python, Java, Go, Rust, Git, GitHub Copilot, ChatGPT Enterprise, Oracle AI, Codex, YANG, OpenConfig, NETCONF, gNMI, OCI - DNS, TCP/IP
1mo
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Principal Data Engineer
Philadelphia, Pennsylvania, United States
HybridFull Time
10+ YOE3+ Mgmt10+ years in data or software engineering, 7+ years building production data pipelines, strong Databricks/Spark/PySpark/SQL experience, Azure and streaming expertise, plus leadership and production operations experience.
Databricks, PySpark, Spark SQL, Spark, Python, SQL, Delta Lake, Databricks Workflows, CI/CD, Azure, Azure Event Hubs, Azure Stream Analytics, Azure Service Bus, Azure Data Factory, Azure Functions, ADLS, Azure Cosmos DB, Event Grid
1mo
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Principal Solutions Engineer
Malvern, Pennsylvania, United States
HybridFull Time
5+ YOE5+ years software development experience in retail payments with expertise in POS integration, remote teamwork, Microsoft .NET Framework & Linux, C++/C#/Java, REST API and data exchange specifications.
Microsoft .NET Framework, Linux, C++, C#, Java, REST API
2w
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Regional Geotechnical Principal
Mount Laurel or Philadelphia
$125k-$175k/yr OnsiteFull Time
12+ YOERequires 12 years of related experience, a civil or geological engineering degree, PE or PG licensure, geotechnical expertise, leadership, business development, project management, and advanced analysis software proficiency.
1mo
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Principal Data & Machine Learning Engineer
Malvern, Pennsylvania, United States
HybridFull Time
10+ YOE3+ Mgmt10+ years in software/data engineering and ML, 3+ years technical leadership, strong Python and SQL, cloud data/ML platform experience (Azure preferred), production model lifecycle ownership.
Azure, Python, SQL, Microsoft Fabric, OneLake, Databricks, Synapse, Azure DevOps, CI/CD, ETL/ELT
1mo
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Principal Overhead Transmission Line Engineer
New York or Los Angeles or Chicago or Dallas or Houston or Philadelphia or Charlotte or Boston or Denver
$156k-$204k/yr HybridFull Time
15+ YOELicensed PE, 15+ years overhead transmission line design experience, advanced knowledge of NESC/RUS/ASCE, proficiency with PLS tools and foundation software, client-facing and mentoring experience.
PLS-CADD, PLS-Pole, PLS-Tower, MFAD, LPile, Microsoft Excel, AutoCAD
3w
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Principal Architect IRC296102
Atlanta or Austin or Charlotte or Chicago or Dallas or Denver or New York City or Philadelphia or San Diego or San Jose or Seattle or United States
$160k-$220k/yr RemoteFull Time
15+ YOE15+ years in software/product/platform/solution architecture with AI tooling fluency, SDLC/Agile/DevSecOps expertise, customer-facing technical experience, and knowledge of AI governance and production readiness.
Claude Code, Google Cloud Code, OpenAI Codex, GitHub Copilot, Cursor, Windsurf, LangChain, AutoGen, LlamaIndex, Semantic Kernel, MCP, OpenAI, RAG, Vector Databases